Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60D—VEHICLE CONNECTIONS
  • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
  • B60D1/48—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting
  • B60D1/56—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting securing to the vehicle bumper
  • B60D1/565—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting securing to the vehicle bumper having an eyelet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60D—VEHICLE CONNECTIONS
  • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
  • B60D1/24—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions
  • B60D1/247—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions for improving weight distribution
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60D—VEHICLE CONNECTIONS
  • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
  • B60D1/14—Draw-gear or towing devices characterised by their type
  • B60D1/18—Tow ropes, chains or the like
  • B60D1/187—Tow ropes, chains or the like characterised by the connection to the towing vehicle or to the trailer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60D—VEHICLE CONNECTIONS
  • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
  • B60D1/24—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions
  • B60D1/36—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions for facilitating connection, e.g. hitch catchers, visual guide means, signalling aids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60D—VEHICLE CONNECTIONS
  • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
  • B60D1/48—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting
  • B60D1/488—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting mounted directly to the chassis of the towing vehicle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
  • B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
  • B60P3/12—Vehicles adapted to transport, to carry or to comprise special loads or objects for salvaging damaged vehicles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
  • B60P7/00—Securing or covering of load on vehicles
  • B60P7/06—Securing of load
  • B60P7/08—Securing to the vehicle floor or sides
  • B60P7/0807—Attachment points

Definitions

• the present invention generally relates to recovery vehicles and, more specifically, to a
• D-ring/shackle used by a recovery vehicle to recover disabled vehicles.
• Recovery vehicles such as tow trucks and car carriers typically employ a motorized winch with a steel cable or rope for pulling loads, such as disabled vehicles, from the rear or sides of the recovery vehicle.
• Conventional D-ring shackles also known as “clevis,” “hitch” or
• “tow” shackles are used as a permanent lifting point and intended for straight line pulling as side pulls can twist or bend the D-shaped shackles. Shackles or D-rings may be used to direct the pulling of a load.
• a conventional D-ring used in the towing and recovery industry, is typically mounted on a fixed plate, These plates have holes for a pin, and a pin secures tlie D-ring to the fixed plate.
• This design permits only a single degree of freedom for the D-ring to move, and concentrates the load to a single point, thereby limiting its load capacity.
• D-rings are also not designed to be sideloaded, and their ideal loading capacity must therefore be reduced as the angle of the load is increased from the centerline of the D-ring.
• this problem was solved by adding multiple D-rings at different angles to allow the D-ring to be loaded in a manner approximating its ideal loading capacity.
• D-rings are rarely used at their ideal loading capacity; instead, they are almost always loaded at some angle that is not ideal to the design intent, with incurring corresponding torsional/shearing forces that can result in D-ring pin failure, as one prominent example.
• Hoist rings are known rigging hardware used as a securement point during an overhead lift, generally used in the overhead crane industry. The hoist ring is typically secured by a single bolt. A drawback of this design is that it concentrates the load to a single point, thereby limiting the load capacity of the design. Hoist rings are not specifically designed for heavy side pulling as used in the recovery industry.
• the new D-ring will be able to rotate up to 360° about a center axis, and pivot preferably 180° normal to the center of rotation.
• a rotatable, automatically self-aligning device may be mounted on or associated with a recovery vehicle, such as a tow truck or car carrier, for supporting and pulling a load.
• the device includes an outer housing rigidly attached, such as by bolting or welding, to the recovery vehicle, or to an apparatus or component (e.g., a boom, an underlift, a rear tailgate, or a side portion of the recovery vehicle) associated with the recovery vehicle.
• the device may also include a base plate located adjacent the outer housing and capable of rotating relative to the housing, such as up to a 360° rotation, and a bearing with one or more apertures attached to, or formed as part of, the base plate.
• At least one shackle pinned to the one or more bearing apertures is also provided.
• the shackle is capable of rotating with the base plate, thereby causing the device to automatically self-align along a centerline of the shackle relative to a direction of the load when a cable threaded from the recovery vehicle through the shackle, in order to pull an attached load.
• the housing, base plate, bearing and shackle may each be made of high-strength steel, for example.
• various components may be located between the housing and the base plate, such as a wear pad, ball bearings, roller bearings, traveler rollers, etc.
• components may be used to temporarily angularly lock the rotating plate in a fixed orientation relative to the housing.
• spring-loaded detents and mating notches may be provided on the outer periphery of the housing and the plate, respectively (or vice-versa).
• the rotating base and the outer housing may be detachably connected, such as by using piano wire, which may be located within machined passages of either the housing, or the rotating plate, or both the housing and the rotating plate.
• two or more fastener passages may be located about the periphery of either the housing or the rotating plate or both the housing and the rotating plate, offset from each other, to accommodate the piano wire while allowing the passages to be blocked by fasteners.
• the fasteners may also provide greasable passageways.
• Different base plates may be used, and detachably attached to the housing,
• the different base plates may each have different bearings for use with shackles of different sizes or shapes.
• a first bearing associated with a first base plate may have a single aperture, while a second bearing associated with a second base plate may have two or more apertures.
• the D-ring assembly of the present invention may be designed to handle various loads, such as, in a non-limiting manner, loads in the range of 20,000-50,000 pounds, although for a given application, lesser or greater design loads may be accounted for in the design.
• the D-ring assembly may also be designed to be capable of pulling a load in any direction within 180° of the shackle.
• a method for using a rotatable, automatically self-aligning device mounted on or associated with a recovery vehicle for supporting and pulling a load also forms part of the present invention.
• the method may include the steps of: mounting an outer housing rigidly to the recovery vehicle, or to an apparatus or component associated with the recovery vehicle; providing a base plate adjacent the outer housing, capable of rotating relative to the housing; providing a bearing having one or more apertures, attached to, or formed as part of, the base plate; and providing at least one shackle pinned to the one or more apertures of the bearing, the shackle being capable of rotating with the base plate.
• a cable may be threaded from the recovery vehicle, or from another origin point, through the shackle, and attached to a load distanced from the recovery vehicle or the origin point. Pulling on the load then causes the shackle to automatically self-align along a centerline of the shackle relative to a direction of the load.
• FIGURE 1 is a rear partial perspective view of a tow truck equipped with a preferred embodiment of a pair of D-ring assemblies of tire present invention
• FIGURES 2-3 are front, and top and side, perspective views, respectively, of the D-ring assembly shown in FIGURE 1;
• FIGURE 4 is a left-side cross-sectional view of a D-ring assembly shown in FIGURE 1;
• FIGURE 5 is a top and side perspective view of anotlier preferred embodiment of a D- ring assembly of the present invention
• FIGURE 6 is a front perspective view of the D-ring assembly shown in FIGURE 5;
• FIGURE 7 is a right-side perspective view of the D-ring assembly shown in FIGURE 5;
• FIGURE 8 is a top and side perspective view of yet another preferred embodiment of a
• FIGURE 9 is a top and side perspective view of another preferred embodiment of a D- ring assembly of the present invention, using piano wire to detachably assemble the housing and rotating base plate;
• FIGURE 10 is a side cross-sectional view of the D-ring assembly shown in FIGURE 9, taken along reference line 10-10 of FIGURE 9;
• FIGURE 11 is a partial, front and side cross-sectional view of the D-ring assembly shown in FIGURE 9, taken along reference line 11-11 of FIGURE 9;
• FIGURES 12-13 are top and side perspective views of still further preferred embodiments of a D-ring assembly of the present invention, showing ball bearings and roller bearings, respectively, located between the housing and rotating base plate; and
• FIGURE 14 is a top perspective view of another preferred embodiment of a D-ring assembly of the present invention, illustrating spring-loaded detents capable of communicating with notches to temporarily lock the rotating plate relative to the outer housing.
• the present invention generally concerns a rotating D-ring assembly located on a recovery vehicle such as a tow truck or car carrier 10, for recovering disabled vehicles.
• FIGURE 1 shows the rear of a tow truck, with a preferred embodiment of the rotating, self-aligning D-ring assembly 20 mounted on the rear guards 12 of the chassis of the tow truck. Stabilizer legs 14 are also shown, along with tow truck tires 16.
• D-ring assembly 20 may be welded and/or bolted to the recovery vehicle. It will also be understood that the D-ring assembly of the present invention may be located in other positions, such as the tailgate, at the end of booms, on the side of vehicles, etc.
• D-ring assembly 20 of the present invention may include an outer housing 22 with apertures 21 located about the housing, accommodating bolts 23 for rigidly fastening the D-ring assembly to the rear of the vehicle chassis.
• Rotatable base plate 24 may be confined in position based on the topography of the adjacent outer surfaces of housing 22 and base plate 24, such as by their interlocking geometry (e.g., referring to FIGURE 4, plate outer edges 24a could be confined for rotational movement within the inner peripheral edges of housing 22).
• D-ring assembly 20 may also include a pin eye/bearing 26 with apertures 26a which may be welded to rotating base plate 24. Pin eye/bearing 26 carries shackle 27 with shackle aperture 27a.
• rotating base plate 24 may have different sizes and/or numbers of bearings to accommodate various sizes of D-ring shackles
• shackle T1 is referred to here as a “D-ring” in the parlance of the recovery vehicle industry, the shackle claimed below need not be in the form of a “D” and can take other general shapes.
• pin 28 passes through bearing apertures 26a and mounts shackle
• apertures 29 may be provided to accept grease for lubricating corresponding components.
• housing, plate, shackle and other components of the D-ring assembly of the present invention may be made of high strength steel or another hard, wearable metal such as brass.
• D- ring assembly 20 is self-aligning to pull in the direction of the load (i.e., the D-ring is constructed so that it can achieve maximum load when pulled in the centerline or at the centroid of the D- ring, and the self-aligning D-ring assembly of the present invention will ensure that the load is maintained in this direction).
• D-ring 20 may take various embodiments, such as using a bearing, piano wire, frictional surface, wear pad, or spring-loaded detent.
• FIGURE 8 shows a wear pad 40, which may be made of synthetic polymers, such as Nylon,
• rotating plate 24 may include “piano wires” 30, 31 and 32
• outer housing 22 e.g., a tempered high-carbon steel string, also known as spring steel
• rotating plate 24 for detachably securing rotating plate 24 to outer housing 22, allowing these components to be cleaned and re-painted, for example.
• the intersection of outer housing 22 and rotating plate 24 may be formed to include machined channels 30a, 31a and 32a, to respectively accommodate wires 30, 31 and 32.
• Machined channels 34, 35 and 36 may be blocked by drilled bolts 34a, 35a and 36a, respectively, to allow entry of wires 30, 31 and 32, respectively, while greaseable passages 39 (FIGURE 11) blocked by fasteners 38 (secured by nut 38a) provide entry to the wires and wire grooves in the outer housing and/or base plate. Wire entrances are offset so as to not concentrate drill passages in the outer housing. It will be understood that the machined channels may be located in only the housing, or only the rotating plate, or in both as shown.
• FIGURE 12 another version of a rotating, self-aligning D-ring assembly is shown, with ball bearings 35 located between rotating base plate 24 and fixed outer housing 22, to decrease the friction between the plate and housing, increasing their wearability.
• FIGURE 13 shows roller bearings 37 used instead of ball bearings 35.
• other types of bearings or components could be used, such as the “traveler roller” components disclosed in U.S.
• Patent No. 9,028,196 which is hereby incorporated by reference in its entirety herein.
• one or more detents 40 could be used to temporarily lock rotating plate 24 into position relative to outer housing 22.
• notches 41 may be provided on the periphery of plate
• Detent 40 may be spring-loaded using spring 43, so that it is normally in a retracted position until allowed to be in an extended position when its end lies within notch 41, automatically and temporarily locking plate 24 from rotating. In order to remove 24 from its temporarily-locked position, an operator could simply exert enough rotational force to retract the detent.
• notches 41 may be provided with slight angles on the outer walls, not shown, to allow the detent to retract. This will enable the rotatable plate to still automatically align in the direction of the applied load, while remaining in a certain angular orientation when no load is applied.

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• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Vehicle Body Suspensions (AREA)
• Support Of The Bearing (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=85797073

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (21)

• 2021
  • 2021-10-12 US US17/499,055 patent/US12280624B2/en active Active
• 2022
  • 2022-08-22 CA CA3234814A patent/CA3234814A1/en active Pending
  • 2022-08-22 EP EP22881528.8A patent/EP4416014A4/de active Pending
  • 2022-08-22 WO PCT/US2022/040993 patent/WO2023064036A1/en not_active Ceased

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